feat: add Elec — dark mode multi-model chat UI

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

Elec/vite.config.ts

@@ -0,0 +1,19 @@
+import { defineConfig } from 'vite'
+import react from '@vitejs/plugin-react'
+import electron from 'electron-vite/plugin'
+
+export default defineConfig({
+  plugins: [
+    react(),
+    electron([
+      {
+        main: {
+          entry: 'src/main/index.ts',
+        },
+        preload: {
+          input: 'src/preload/index.ts',
+        },
+      },
+    ]),
+  ],
+})